pit falls quiz Flashcards
Shannon diversity is denoted by
H
scale of shannon diversity:
0 to infinity: where higher # indicates greater diversity
H=0 means
the community has 1 species
what is Shannon’s diversity index?
a way to measure the diversity of species in a community
the intermediate disturbance hypothesis (IDH) suggests that
local species diversity is maximized when ecological disturbance is neither too rare nor too frequent
at low levels of disturbance…
Strong organisms outcompete weaker ones, leading to the weaker ones dying out and the strong ones becoming the dominant species in the ecosystem.
at high levels of disturbance…
all species are at risk of extinction
examples of high levels of disturbance
frequent forest fires or deforestation
y axis
species diversity
x axis
frequency of disturbance
recessional species indicate
the stage of growth after a big disaster
what is Shannon’s diversity index?
a way to measure the diversity of species in a community
recessional species order (roughly)
- moss/lichen
- grass/shrubs
- alder trees (introduce nitrogen)
- trees
- DIVERSITY